Time and number of telephonic



(No Model I 4 Sheets-Sheet 1. E. KOSANKE, 0. FUHR 82; B. KRAUSSE. APPARATUS FOR STATING TIME AND NUMBER OF TELEPHONIU 1 l H a U Au 8 u n 8 mm P I T s R E V N 0 G fiarney.

(No Model.) 4 SheetsSheet 2.

, E. KOSANKE, G. PUHR & B. KRAUSSE.

APPARATUS FOR STATING TIME AND NUMBER OF TELBPHONIG oouvmsuxous.

No. 597,003. Patented Jan. 11, 189 8.

(No Model.) 4 Sheets-Sheet 3.

E. KOSANKE, O. FUHR & B. KRAUSSE. APPARATUS FOR STATING TIME ANDNUMBBR OP TELEPHONIO CONVERSATIONS. I No. 597,003. Patented Jan. 11,1898.

M65566 WW (No Medal.) 4 SheetsSheet 4. E. KOS ANKE, C. FUHR & B. KRAUSSE. APPARATUS FOR STATING TIME AND NUMBER OF TELEPHONIU CONVERSATIONS. No. 597,003. Patented Ja'nfll, 1898.

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UNITED STATES PATENT @EEicE.

ERIGII KOSANKE, CARL FUHR, AND BRUNO KRAUSSE, OF IVILMERSDORF, GERMANY, ASSIGNORS TO HEINRICH EIOHI/VEDE, OF BERLIN, GERMANY.

APPARATUS FOR STATING TIME AND NUMBER OF TELEPHONIC CONVERSATIONS.

SPECIFICATION forming part of Letters Patent No. 597,003, dated January 11 1898.

Application filed July 5, 1895. $erial No. 555,021. (No model.)

To 0055 whom it may concern..-

Be it known that we, ERICH KOSANKE, CARL FUHR, and BRUNO KRAUSSE, subjects of the King of Prussia, German Emperor, and residents of Wilmersdorf, near Berlin, in the Kingdom of Prussia, in the German Empire, have invented a certain new and useful Improved Apparatus for Stating the Time and Number of Telephonic Conversations, of which the following is a specification.

The present invention has for its object to provide an apparatus for indicating the time and number of telephonic conversations, which apparatus may be set in operation or disconnected by the participants themselves, thereby dispensing with the control or assistance on the part of the operating ofiicials.

The present invention is based on the principle that the registering mechanism of the apparatus belonging to the calling operator is electrically actuated by the called operator when the latter takes off the ear-trumpet of his telephone and that the said registering mechanism is stopped by the calling operator when he has finished the conversation.

The apparatus is represented in the anneXed drawings, in which Figure 1 is a rear view; Fig. 2, a top view; Fig. 3, a section on line A B of Fig. 1, as seen from the right; Fig. 4:, a section on line A B of Fig. 1, as seen from the left; Fig. 5, a rear view substantially as shown in Fig. 1, but on an enlarged scale; Fig. 6, an enlarged top view. Fig. 7 is a perspective view of part of the mechanism shown in Figs. and 6. Fig. 8 is a diagram showing the manner of arranging the apparatus with the main parts of the telephones of the calling and called operator.

The apparatus consists of a clockwork 1 and a numbering mechanism 2, both 1 and 2 being, as hereinafter described, actuated by the electrical part of the apparatus connected with the conductor of the telephone. On the shaft 3 of the spring 4 of the clockwork 1 is mounted a one-armed lever 5, the limit of the movements of which is determined in one direction of the contact-spring 7, secured to the contact 6, and in the opposite direction by the springs 16 and 11, attached to the contacts The one extremity of spring 7 is adapted to lie against a contactpiece 12, while the extremities of springs 10 and 11 are adapted to contact with pieces 13 and 14:, respectively.

The balance or pendulum 15 of the clockwork 1 is so arranged that it may be kept in the position shown in Fig. 1 by the arm 16 of the armature 17 of an elcctromagnet 1S, ar ranged above said balance 15. The armature 17 supports another arm 26, which engages with the wheel 29 by means of latch 27, said wheel being at the same time prevented from moving backward by a pawl 28.

19 is another electromagnet, the armature 20 of which engages, by means of the arm 21, with a spring 22, while its arm 23 rests against a contact-spring 24, the latter being, according to its position, in or out of connection with the contact-plate 25.

is a third electromagnet the armature 32 of Which engages with the contact-spring 24.- by means of an arm 33, Figs. 5 and 6, in such a manner that spring 2% makes connection with the curved end of the plate 25 when the armature 32 is moved toward its electromagnet 30, and that spring 2% breaks connection with the contact-plate 25 when the electromagnet 19is energized, the armature 20 of which moves back the spring 2a by means of the arm 23 engaging said spring, as shown in Figs. 5, 6, and 7.

34 is a circuit-closer, which, although surrounded by the conductors, is insensible to the weak talking-circuit, but which, when actuated by a more intensive current, is electromagnetically forced to close the circuit between the battery 41 and the switch leading to the electromagnet 18.

The manner in which the apparatus described operates is hereinafter demonstrated with the aid of the diagram Fig. 8 by explaining the successive stages of operation when a participant calls or is called. In this diagram the bell or call circuit is connected to the contact I on the left side, the secondary or talking circuit is connected to the middle contact-block II, and, finally, the groundconductor is in connection with the contact III at the right side.

In the normal position of the instruments the levers 5 engage the contact-spring 7, closing the break at 12 with the ground-wire.

In order to call a station, the calling operator turns his lever 5 to the right, as shown at the left in Fig. 7, which winds up the clock-spring and. completes the bell-circuit from the calling-station on the left through its calling-generator to the bell at the called station on the right. The circuit at the calling-station is therefore as follows: groundconduct-or,electromagnet 19, contact 8, spring 10, contact 13, generator 35, contact 43, contact I, the circuit now going to the called stationnamely, to contact I, contact 43, receiver-hook 37, bell42, electromagnet30,oontact 6, spring 7, contact 12, and to the groundwire on the right.

The connections of the inductor on one side lead to the safety contact-block 43, sheltering the apparatus from the dangers of lightning, and from here to the contact I on the other side they are attached to the contactpiece 13. On the inductor being set in action by the calling operator (left of Fig. 8) the usual effect of ringing the bell 42 at the called station (right of Fig. 8) will be produced. The operation of the above inductor 35 will also energize the electromagnet 19 at the calling-station and cause it to break contact between contacts 24 and 25 at the calling-station by its attraction of the armature 20, Figs. 5 to 7, the arm 23 of which draws back the contact-arm 24 into the hollow of the contact 25, so that it ceases to touch the latter. The armature 20 is afterward drawn back by the spring 22, leaving the arm 24 out of contact. The same operation of the in ductor 35 at the calling-station will also energize the electromagnet 30at the called sta tion and cause its armature 32, Figs. 5 to 7, by means of the hook 33 to insure that the contact-arm 24 at the called station shall be in contact with the contact-spring 25.

The talking-circuit, or so much of it as is at the calling-station before the contact between 24 and 25 was broken, proceeded through such contact direct to earth-that is to say, it was as follows: contact III, contacts 24 25, battery 44, contact II, receivers 36 36, secondary coils 47 of transmitter to contact 46. Now, however, on the breaking of the contact at 24 25 the talking-circuit becomes as follows: contact III, coil of circuit-closer 34, contact 9, spring 11, contact 14, battery 44, and so on as before to contact 46.

As before said, the current from battery 44 is not sufficient to operate the circuit-closer 34.

On the calling person removing his receivers 36 the hook 37 is lifted by its spring and, leaving contact 48, makes contact with 46, thus breaking the call-circuit to himself and closing the talking-circuit, which now passes through hook 37 to contact 43 and contact I, thence to the called station, where it passes to contact I, contact 43, and hook 37. Then the latter is raised, it will pass to contact 46, secondary circuit of transmitter 47, receivers 36, contact II, battery 44, contact 25, contact 24, and contact III.

The action of the called person in releasing his hook 37 will cause at the called station the contact 38 to move against and trip the contact 40, which is electrically connected to contact Contact 38 is electrically connected through the powerful battery 41 to contact III. lonsequently at the moment of contact of the contacts 38 40 this powerful battery 41 will be brought into the circuit just before the hook 37 at the called station touches contact 46. The powerful momentary current thus produced in the circuit will so energize the coil of the circuit-closer 34 at the calling-station that the circuit-closer 34 closes momentarily its contacts 49 50, which close a momentary local circuit at the calling station, comprising the battery 41 and the electromagnet 18 there. The raising of the hook 37 at each station also closes contacts 51 52, which close the primary circuit of the transmitter that is to say, a circuit through its primary coil 53, microphone 54, battery 55, and contacts 51 The energizing of the electromagnet 18 at the calling-station, as above described, will cause it to attract its armature 17, Figs. 5 and 6, which will be retained by the hooked spring 22. This action of the armature 17 releases the balance or pendulum 15, hitherto stopped by the arm 16 of the armature 17, and, further, the inserting-latch 27 of the arm 26 turns the wheel 29 one tooths length, so that a communication is registered, while the clockwork 1, set in operation by the disengagement of the pendulum, indicates the duration of the dialogue in minutes and seconds. IVhen the communication is finished, the calling person gives the sign of conclusion by turning the crank of his inductor 35. This closes a circuit ru nning as follows: at the calling-station, contact III, electromagnet 19, contact 8, spring 10, contact 13, inductor 35, contact 43, contact I, thence to the called station, contact I, contact 43, inductor 35, to hook 37, whence it pursues one of two courses, according as the hook is raised or repressed. In the former case it passes by contact 46, transmitter secondary coil 47, receivers 36, contact II, battery 44, contacts 24 25, and contact III, and in the latter case it passes by contact 48, bell 42, electromagnet 30, contact 6, spring 7, contact 12, to contact III. The operation of the inductor 35 at the calling-station therefore has the effect of energizing the magnet 19 at the calling-station, which attracts its armature 20, Figs. 5 to 7, drawing with it momentarily by the hook 21 the spring 22, which thus releases the armature 17, allowing it to again press with its arm 18 against the balance-wheel15, and thereby stopping the clock. The arm 26 of the armature 17 glides with the inserting-latch 27 over the next tooth of wheel 29 to register the next conversation.

given the sign of conclusion, the calling person moves the lever 5 back in the position shown in Fig. 1 on the left, whereby the spring of the clockwork 1 is unwound, and by the I'Iaving ZOO contact-spring 7 being pressed against the contact-piece 12 his circuit is restored for receiving calls.

If the calling subscriber, for finishing the conversation and stopping the operation of the register, merely moves the lever 5 in the said manner without giving the sign of conclusion, he would, indeed, cause the register to stop by unwinding the spring; but in this case the armature 17 of electromagnet 18, bein g still held by the spring 22, would not press against the balance 15. Therefore the clockwork 1 would be actuated instantaneously when the calling subscriber desires to have another conversation and moves the lever 5 into its calling position. It is obvious that the calling subscriber in this case must pay unnecessarily for the time which elapses between moving the lever 5 and the beginning of the conversation.

It is evident from the foregoing description that the participant can never be called unless he moves the lever-arm 5 backward, as otherwise his circuit would be disconnected, and it is further evident that he himself cannot call another person without a movement of the lever 5, which insures the winding of the clockwork. As, moreover, the said clockwork and the registering device are set in action upon the receiver being taken off the hook by the person called, a conversation cannot take place in the absence of the latter and therefore never be registered. On the other hand, the calling participant is always able to bring to an end any conversation and arrest the clockwork of the apparatus by giving the sign of conclusion and turning the lever 5 back to its former position.

For the person called the successive stages during the action of calling are the following: In consequence of the preceding operation of the apparatus the circuits, with the exception of the hell or call circuit, are interrupted, the lever 5 thus being in position, as shown in Fig. 1 on the left. hen the act of calling is performed, the call-circuit runs through the electromagnet at the called station, the armature 31 of which is attracted, and the contact between the spring 24 and the plate 25, if not already existing, is restored by the arm 33 of said armature, whereby the circuit with the ground is connected. Said arm 33 of the armature 32 is bent at its forward end,

so as to form a hook embracing the contactspring 24 at the opposite side of arm 23. Therefore by the attraction of the armature 32 the spring 2e will be turned toward the right side, Fig. 6, thereby coming again in contact with the free end of the contact 25. As the contact-springs 10 and 11 do not rest on the contact-pieces 13 and 14:, the inductor 35 and the circuit-closer 34, as well as the two electromagnets 18 and 19, are disconnected from the circuit, the result being that for a person called a conversation cannot be registered. On the latter taking off the receiver 36 the arm 38 of the hook 87 passes the contact 40 at the called station 40, thereby closing for a moment the circuit of the local battery 4:1, with the result that in the manner described a strong current is passed through the apparatus at the calling-station where the circuit-closer 3a is set in action. The conversation being finished, the called subscriber replaces his receiver without, however, giving the sign of conclusion, as the circuit of his inductor 35 is disconnected.

In the diagrammatic view of Fig. 8 at each station, as usually, two receivers are arranged which are connected by wires and cont-actblocks 56 57 58 in a well-known manner.

We claim as our invention 1. In a telephone system the combination of a registering time mechanism, means controlled by the movement of the parts at the calling and called subscribers to a position for conversation for starting the register, and means controlled bythe restoration of the parts at the calling subscribers for stopping the register, substantially as described.

2. The combination with contacts in the call and speaking circuits, of lever 5 adapted to close and interrupt the said circuits alternately and a clockwork 1 adapted to be wound and released by the circuit closing and interrupting movements of said lever.

In testimony whereof we have signed this specification in the presence of two subscribing witnesses.

ERIOH KOSANKE. CARL FUHR. BRUNO KRAUSSE.

YVitnesses:

WM. HAUPT, Orro SIEDEKTOPF. 

